A fixing device and a fixing method for measuring pressure

Abstract

A fuser pressure measuring device includes a base, a power assembly arranged on the base, and a measuring assembly, wherein the power assembly includes a transmission gear and a rack arranged on the base, wherein the transmission gear meshes with the rack and the fuser gear at the same time, and the transmission gear matches with the rack and the fuser gear at the same time, and the transmission ratios among the three are the same, and the rack is connected to the measuring assembly in a transmission manner, and the measuring assembly includes two left and right pressure sensors, which are respectively arranged at the upper and lower rollers of the fuser and can be inserted and withdrawn between the upper and lower rollers of the fuser, and each of the pressure sensors is connected with a variable resistor, and the variable resistor is also connected with an ohmmeter to display the sum of the resistances of the variable resistor and the pressure sensor. Whether the pressure on both sides of the upper and lower rollers of the fuser is qualified is expressed in the form of resistance value, and real-time adjustment is made, which effectively improves the accuracy and efficiency of pressure measurement and adjustment, and can also measure the finished fuser.

Description

Technical Field

[0001] The invention belongs to the technical field of printing equipment, and in particular relates to a fixing device pressure measuring device and a measuring method. Background Art

[0002] The fuser is a key device in the electronic imaging system that heats, melts, and squeezes the toner to fix it on the recording medium. The device is usually composed of a set of upper and lower relative bodies that form a fixing nip under pressure and rotate relative to each other at the same speed. For example, the upper roller is formed by a lamp tube with a heating function, an oil-cotton component with a pressure effect, and a fixing film that transfers heat and pressure. The lower roller is formed by a fluorine sleeve with wear-resistant, high-temperature-resistant, non-stick properties, silicone rubber with elastic deformation, and an iron core rod. The final imaging quality of the recording medium is directly related to the temperature and pressure settings of the fuser.

[0003] The pressure of the fuser is mainly controlled by a group of compressible spring structures. If the pressure is too high, it will cause wrinkled paper, double images and shorten the service life of the fuser; if the pressure is too low, it will cause non-fixing; and if the pressure difference between the left and right sides is too large, it will seriously shorten the service life of the fuser film in the fuser. Therefore, controlling the pressure of the fuser is particularly important for the quality of the fuser.

[0004] The conventional method is to use a pressure sensor in series with a multimeter, rub the gear with your thumb to rotate the upper and lower rollers, so that the resistive film pressure sensor enters between the upper and lower rollers, and read the resistance value on the multimeter to determine whether the pressure is qualified. However, this operation method has the following shortcomings:

[0005] 1. The rubbing gear puts a heavy load on the thumb, which can easily cause pain, swelling and calluses on the thumb of workers.

[0006] 2. Only one-side measurement is possible. When the pressure on one side is adjusted, the pressure on the other side will also change. Therefore, in general, it is necessary to repeatedly measure and adjust the pressure of a fuser four times, which is inefficient.

[0007] 3. The position of the pressure sensor of the upper and lower rollers each time depends on the workers' visual senses, which makes it difficult to achieve complete consistency before and after, which increases the measurement error to a certain extent.

[0008] 4. After a large number of measurement experiments, it was found that as the pressure sensor is used more and more times, when measuring the same pressure, the resistance reading will gradually increase, thereby increasing the measurement error (hereinafter referred to as "basic resistance value offset").

[0009] 5. To control the measurement accuracy, the pressure sensor needs to be replaced every time the pressure adjustment work of 50 fusers is completed (equivalent to 200 pressure measurements), which is very costly.

[0010] Traditionally, a patent with application number CN201020665458.6 discloses a fuser pressure measuring device, which consists of a roller-shaped measuring device body and a pressure measuring part with a load sensor. The main working principle is to pre-install a pressure measuring device on a semi-finished fuser to replace the upper roller of the original fuser, adjust the fuser pressure to a set value and record the spring compression, then install the upper roller and adjust the pressure between the upper and lower rollers of the fuser to the set value according to the aforementioned spring compression.

[0011] However, this method of measuring pressure by installing a measuring device instead of the upper roller on the fuser has defects. After the measurement is completed, the pressure measuring device must be removed (this process requires the set spring pressure to be released), and the spring must be adjusted according to the spring compression amount corresponding to the set pressure measured previously after the upper roller is installed. There are problems of cumbersome steps, low efficiency and increased pressure regulation error. In addition, this method cannot be applied to the pressure measurement of finished fusers and has certain limitations.

[0012] Therefore, there is an urgent need for a fuser pressure measuring and adjusting device and a measuring method, which can quickly and accurately measure and adjust the pressure between the upper and lower rollers of the fuser, reduce the labor intensity of the staff, and improve work efficiency. Summary of the invention

[0013] In order to solve the above problems, the purpose of the present invention is to provide a fuser pressure measuring device and a measuring method, aiming to solve the problems of poor measurement accuracy, low efficiency, high labor intensity and inapplicability to finished fusers in the existing fuser pressure measuring device and measuring method.

[0014] In order to achieve the above-mentioned object, in a first aspect, the present invention provides a fuser pressure measuring device, characterized in that it comprises a base, a power component and a measuring component arranged on the base, the measuring component is slidably arranged on the base, and the base is also provided with a fuser bracket for supporting the fuser;

[0015] The power assembly includes a transmission gear and a rack arranged on the base, the transmission gear meshes with the rack and the fuser gear at the same time, the rack is in transmission connection with the measuring assembly, and the power assembly drives the measuring assembly to enter and exit the fuser;

[0016] The measuring component includes two left and right pressure sensors, which are respectively arranged at the upper and lower rollers of the fuser, and can be inserted and withdrawn between the upper and lower rollers of the fuser under the drive of the power component. Correspondingly, each of the pressure sensors is connected to a variable resistor, and the variable resistor is also connected to an ohmmeter for displaying the sum of the resistance values ​​of the variable resistor and the pressure sensor.

[0017] As a further improvement of the above scheme, the fuser pressure measuring device also includes a calibration platform assembly, which includes a calibration platform base, a calibration platform body and two weights. The calibration platform body is placed on the calibration platform base. A weight bracket is provided on the upper part of the calibration platform body. The weight is placed in the weight bracket to simulate the pressing position and standard pressure between the upper and lower rollers of the fuser.

[0018] As a further improvement of the above scheme, the power assembly also includes a driving wheel, a fixed seat, a transmission shaft and a bearing. A transmission shaft is passed through the middle of the transmission gear. A driving wheel is provided at one end of the transmission shaft and a bearing is provided in the middle. A fixed seat is provided on the bearing.

[0019] As a further improvement of the above solution, the driving wheel is driven by a hand wheel or a power motor.

[0020] As a further improvement of the above solution, the pressure sensor is a resistive film pressure sensor.

[0021] As a further improvement of the above solution, a limit block is provided on the upper part of the rack, and a limit bracket is provided at the end of the rack.

[0022] As a further improvement of the above scheme, the measuring component also includes an ohmmeter bracket unit, which includes an ohmmeter bracket base, a variable resistor bracket, an ohmmeter bracket, a locking bolt and a nut. The ohmmeter bracket base and the right side of the ohmmeter bracket are provided with an arc-shaped long hole. The ohmmeter bracket base and the ohmmeter bracket are connected by a locking bolt, and the ohmmeter bracket base is fixedly connected to the sensor bracket base.

[0023] As a further improvement of the above solution, the locking bolt is a butterfly locking bolt, and the nut is a welding nut.

[0024] As a further improvement of the above solution, the variable resistor is a knob-type variable resistor.

[0025] In a second aspect, the present invention further provides a measurement method using the above-mentioned fuser pressure measurement device, the steps of which include:

[0026] S1: Install the assembled finished fuser onto the fuser bracket and align the fuser gear with the transmission gear.

[0027] Quasi-meshing;

[0028] S2: Turn the transmission gear, the power assembly drives the measuring assembly and the lower roller of the fuser to move, and the pressure sensor moves

[0029] Between the lower and upper rollers of the fuser;

[0030] S3: The pressure sensor enters the preset pressure measuring position for testing. The pressure measured by the pressure sensor is the required pressure.

[0031] The pressure to be measured;

[0032] S4: Read the value displayed on the ohmmeter, and adjust the pressure between the upper and lower rollers of the fuser until the ohmmeter reaches the set standard value;

[0033] S5: After the pressure measurement and pressure adjustment are completed, the transmission gear is rotated in the reverse direction and the pressure sensor is withdrawn from the fuser.

[0034] Since the present invention adopts the above technical solution, the beneficial effects of this application are:

[0035] 1. A fuser pressure measuring device invented, comprising a base, a power assembly arranged on the base, a measuring assembly and a calibration platform assembly, especially the arrangement of two left and right pressure sensors of the measuring assembly, especially the arrangement of a resistive film pressure sensor, which accurately expresses whether the pressure on both sides of the upper and lower rollers of the fuser is qualified in the form of resistance value, adjusts in real time, and through regular calibration, effectively improves the accuracy and efficiency of pressure measurement and adjustment, and can measure the finished fuser while reducing the consumption of pressure sensors by 90%.

[0036] 2. The setting of the driving wheel and the corresponding transmission parts replaces the finger rubbing of the gears, which significantly reduces the labor intensity and improves the labor efficiency.

[0037] 3. The transmission gear is matched with the rack and the fuser gear at the same time, and the transmission ratio between the three is the same. The transmission gear in the powertrain meshes with the rack and the fuser gear at the same time, so that the linear speed of the sensor bracket unit and the upper and lower rollers of the fuser are consistent, making the pressure sensor enter between the upper and lower rollers of the fuser more smoothly and labor-saving.

[0038] 4. The position of the measuring component is limited by the limit block, and the pressure sensor enters the same position between the upper and lower rollers of the fuser each time it measures, eliminating the error caused by different measurement positions due to human operation and improving the accuracy and efficiency of the measurement.

[0039] 5. The setting of the sensor bracket unit and the ohmmeter bracket unit provides support and fixation for the measuring component, facilitates the measuring component to enter the fuser to realize measurement, and realizes the hiding and exposure of the variable resistor to avoid accidental touch affecting the measurement effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0041] Figure 1 This is an exploded view of the complete fuser pressure measurement device.

[0042] Figure 2 This is an exploded view of the base.

[0043] Figure 3 This is an exploded view of the power assembly.

[0044] Figure 4 This is an exploded view of the sensor bracket unit.

[0045] Figure 5 This is an exploded view of the ohmmeter bracket unit.

[0046] Figure 6 An exploded view of the calibration platform assembly.

[0047] Figure 7 It is a cross-sectional view of the measuring device EE where the fuser is installed.

[0048] Figure 8 This is a cross-sectional view of the measuring device FF where the fuser is installed.

[0049] Fig. 9 It is a cross-sectional view of the fuser pressure measuring device and the calibration platform assembly at HH.

[0050] Reference numerals:

[0051] 1. Pressure sensor left; 2. Ohmmeter left; 3. Variable resistor left; 4. Pressure sensor right; 5. Ohmmeter right; 6. Variable resistor right; 7. Rubber feet; 8. Base; 9. Fuser bracket; 10. Slide rail; 11. Rack; 12. Limit block; 13. Limit bracket; 14. Driving wheel; 15. Fixed seat; 16. Bearing; 17. Transmission shaft; 18. Transmission gear; 19. Slide block; 20. Sensor bracket base; 21. Sensor first bracket; 22. Sensor second bracket; 23. Sensor lower fixing bracket; 24. Sensor support plate; 25. Sensor cover; 26. Ohmmeter bracket base; 27. Variable resistor bracket; 28. Ohmmeter bracket; 29. ​​Locking bolt; 30. Nut; 31. Calibration platform base; 32. Calibration platform body; 33. Weight bracket; 34. Weight; 35. Fuser gear; 36. Pin; 37. Pressure regulating bolt; 38. Fuser upper roller; 39. Fuser lower roller. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] It should be noted that all directional indications such as up, down, left, right, front, back, etc. in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0054] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0056] Embodiment 1:

[0057] Reference Figure 1-9 In a first aspect, the present invention provides a fuser pressure measuring device, comprising a base 8, a power assembly and a measuring assembly arranged on the base 8, wherein the measuring assembly is slidably arranged on the base 8, and the base 8 is further provided with a fuser bracket 9 for supporting the fuser;

[0058] The power assembly includes a transmission gear 18 and a rack 11 disposed on the base, the transmission gear 18 simultaneously meshes with the rack 11 and the fuser gear, the rack 11 is in transmission connection with the measuring assembly, and the power assembly drives the measuring assembly to enter and exit the fuser;

[0059] The measuring component includes two left and right pressure sensors 1 and 4, which are respectively arranged at the upper and lower rollers 39 of the fuser, and can be operably inserted and withdrawn between the upper and lower rollers of the fuser under the drive of the power component. Correspondingly, each of the pressure sensors 1 and 4 is connected to a variable resistor 3 and 6, and the variable resistors 3 and 6 are also connected to ohmmeters 2 and 5 for displaying the sum of the resistance values ​​of the variable resistors 3 and 6 and the pressure sensors 1 and 4.

[0060] As a further improvement of the above scheme, the fuser pressure measuring device also includes a calibration platform assembly, which includes a calibration platform base 31, a calibration platform body 32, and two weights 34. The calibration platform body 32 is placed on the calibration platform base 31, and a weight bracket 33 is provided on the upper part of the calibration platform body 32. The weight 34 is placed in the weight bracket 33 to simulate the pressing position and standard pressure between the upper and lower rollers of the fuser.

[0061] Through the above-mentioned settings, especially the settings of the two pressure sensors 1 and 4 on the left and right of the measuring component, the pressure on both sides of the upper and lower rollers of the fixing device can be accurately expressed in the form of resistance value to show whether it is qualified, and real-time adjustment and regular calibration can be performed to effectively improve the accuracy and efficiency of pressure measurement and adjustment, and the finished fixing device can be measured.

[0062] As a further improvement of the above scheme, the power assembly further includes a driving wheel 14, a fixing seat 15, a bearing 16 and a transmission shaft 17. The transmission shaft 17 is passed through the transmission gear 18. The driving wheel 14 is provided at one end of the transmission shaft 17, and a bearing 16 is provided in the middle. The fixing seat 15 is provided on the bearing 16. The driving wheel 14 drives the transmission shaft 17 to rotate, thereby driving the transmission gear 18 to rotate. The arrangement of the driving wheel 14 and the corresponding transmission components replaces the finger rubbing of the gear, which significantly reduces the labor intensity and improves the labor efficiency.

[0063] As a further improvement of the above scheme, the driving wheel 14 is driven by a hand wheel or a power motor. In this embodiment, the hand wheel 14 is used for driving. Specifically, the hand wheel 14 is fixed to the right end of the transmission shaft 17. The operator can turn the hand wheel 14 to synchronously control the forward and backward movement of the sensor bracket and the forward and reverse rotation of the upper and lower rollers of the fuser to achieve the entry and exit of the device; in some embodiments, in order to further reduce the labor intensity of the operator and improve the labor efficiency, the driving wheel 14 is set to be driven by a power motor.

[0064] As a further improvement of the above scheme, the pressure sensors 1 and 4 are resistive film pressure sensors. The resistive film pressure sensor is small in size and easier to insert between the upper and lower rollers of the fuser. It is sensitive to pressure and can timely and accurately convert the pressure change on it into the resistance change, thereby ensuring the accuracy of pressure measurement and adjustment. At the same time, it can also reduce the consumption of the pressure sensors 1 and 4 by 90%.

[0065] As a further improvement of the above scheme, a limit block 12 is provided on the upper part of the rack 11, and a limit bracket 13 is provided at the end. The position of the pressure sensors 1 and 4 entering the fuser is controlled by using the pre-set position of the limit block 12, so as to ensure that the positions of the pressure sensors 1 and 4 entering the fuser are the same each time, thereby avoiding errors caused by different measurement positions due to human factors, and at the same time limiting the up and down jumping of the rack 11. The limit bracket 13 is used to limit the horizontal displacement of the rack 11 to prevent the rack 11 from falling out of the rack 11 groove.

[0066] As a further improvement of the above scheme, the measuring assembly also includes an ohmmeter bracket unit, which includes an ohmmeter bracket base 26, a variable resistor bracket 27, an ohmmeter bracket 28, a locking bolt 29 and a nut 30. The right side of the ohmmeter bracket base 26 and the ohmmeter bracket 28 is provided with an arc-shaped long hole. The ohmmeter bracket base 26 and the ohmmeter bracket 28 are connected by a locking bolt 29, and the ohmmeter bracket base 26 is fixedly connected to the sensor bracket base 20. The ohmmeter bracket unit is fixed on the sensor bracket unit, and the sensor bracket unit includes a sensor bracket base 20, a sensor first bracket 21 fixed on the sensor bracket base 20, a sensor second bracket 22 fixed on the sensor first bracket 21, a sensor lower fixed bracket 23 fixed on the sensor second bracket 22, and a sensor support plate 24 fixed on the sensor lower fixed bracket 23, wherein a sensor cover plate 25 is provided on the sensor support plate 24, a slide block 19 is provided under the sensor bracket base 20, the slide block 19 is slidably connected to the slide rail 10, the sensor bracket base 20 is transmission-connected to the rack 11, and is connected to the slide rail 10 at the bottom of the sensor bracket unit. The groove block 19 cooperates to provide support, fixation and guidance for the sensor bracket unit. The transmission gear 18 transmits power to the rack 11, and the rack 11 drives the sensor bracket unit to move linearly along the slide rail 10, so that the two pressure sensors 1 and 4 fixed on the sensor bracket unit can enter and exit between the upper and lower rollers of the fuser; the locking bolt 29 slides in the arc-shaped long hole, thereby driving the ohmmeter bracket 28 to rotate relative to the ohmmeter bracket base 26 to achieve hiding or exposure of the variable resistors 3 and 6. The variable resistors 3 and 6 are hidden or exposed by adjusting the angle of the ohmmeter bracket 28. They are hidden during the non-calibration process to avoid accidental contact and cause measurement benchmark deviation. They are exposed during the calibration process to facilitate adjustment operations.

[0067] As a further improvement of the above scheme, the locking bolt 29 is a butterfly locking bolt, and the nut is a welding nut. Through the cooperation of the nut 30 and the butterfly locking bolt 29, the clamping or loosening can be adjusted manually, so that the ohmmeter bracket 28 is fixed or loosened.

[0068] As a further improvement of the above scheme, the variable resistors 3 and 6 are knob-type variable resistors. When calibrating the measurement circuit, the resistance values ​​of the knob-type variable resistors 3 and 6 can be adjusted by directly manually rotating them to compensate for the resistance offset of the pressure sensors 1 and 4, thereby extending the service life of the pressure sensors 1 and 4.

[0069] Embodiment 2:

[0070] S1: Install the assembled finished fuser onto the fuser bracket 9, and align and mesh the fuser gear 35 with the transmission gear 18;

[0071] S2: Turn the transmission gear 18, the power assembly drives the measuring assembly and the lower roller 39 of the fuser to move at the same time, and the pressure sensors 1 and 4 enter between the lower and upper rollers of the fuser;

[0072] S3: The pressure sensors 1 and 4 enter the preset pressure measuring positions for testing, and the pressure measured by the pressure sensors is the pressure to be measured;

[0073] S4: Read the values ​​displayed by ohmmeters 2 and 5, and adjust the pressure between the upper and lower rollers of the fuser until ohmmeters 2 and 5 reach the set standard values;

[0074] S5: After the pressure measurement and pressure adjustment are completed, the transmission gear 18 is rotated in the reverse direction, and the pressure sensors 1 and 4 are withdrawn from the fuser.

[0075] The above is a detailed introduction to the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the methods and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A fuser pressure measuring device, characterized in that: It comprises a base, a power component and a measuring component arranged on the base, wherein the measuring component is slidably arranged on the base, and the base is also provided with a fuser bracket for supporting the fuser; The power assembly includes a transmission gear and a rack arranged on the base, the transmission gear meshes with the rack and the fuser gear at the same time, the rack is in transmission connection with the measuring assembly, and the power assembly drives the measuring assembly to enter and exit the fuser; The measuring assembly includes two pressure sensors in the axial direction of the upper and lower rollers of the fuser, and can be operably inserted and withdrawn between the upper and lower rollers of the fuser under the drive of the power assembly. Correspondingly, each of the pressure sensors is connected to a variable resistor, and the variable resistor is also connected to an ohmmeter for displaying the sum of the resistance values ​​of the variable resistor and the pressure sensor; It also includes a calibration platform assembly, which includes a calibration platform base, a calibration platform body and two weights. The calibration platform body is placed on the calibration platform base, and a weight bracket is provided on the upper part of the calibration platform body. The weight is placed in the weight bracket to simulate the pressing position and standard pressure between the upper and lower rollers of the fuser; The measuring assembly also includes an ohmmeter bracket unit, which includes an ohmmeter bracket base, a variable resistor bracket, an ohmmeter bracket, a locking bolt and a nut. The ohmmeter bracket base and the right side of the ohmmeter bracket are provided with an arc-shaped long hole. The ohmmeter bracket base and the ohmmeter bracket are connected by a locking bolt, and the ohmmeter bracket base is fixedly connected to the sensor bracket base.

2. A fuser pressure measuring device according to claim 1, characterized in that: The power assembly also includes a driving wheel, a fixed seat, a transmission shaft and a bearing. The transmission shaft is passed through the middle of the transmission gear. A driving wheel is provided at one end of the transmission shaft and a bearing is provided in the middle. A fixed seat is provided on the bearing.

3. A fuser pressure measuring device according to claim 2, characterized in that: The driving wheel is driven by a hand wheel or a power motor.

4. The fuser pressure measuring device according to claim 1, characterized in that: The pressure sensor is a resistive thin film pressure sensor.

5. The fuser pressure measuring device according to claim 1, characterized in that: A limit block is provided on the upper part of the rack, and a limit bracket is provided at the end of the rack.

6. The fuser pressure measuring device according to claim 1, characterized in that: The locking bolt is a butterfly locking bolt, and the nut is a welding nut.

7. The fuser pressure measuring device according to claim 1, characterized in that: The variable resistor is a knob-type variable resistor.

8. A method for measuring fuser pressure using the device for measuring fuser pressure according to any one of claims 1 to 7, the steps comprising: S1: Install the assembled finished fuser onto the fuser bracket, and align the fuser gear with the transmission gear; S2: Turn the transmission gear, the power assembly drives the measuring assembly and the lower roller of the fuser to move at the same time, and the pressure sensor enters between the lower and upper rollers of the fuser; S3: The pressure sensor enters a preset pressure measuring position for testing, and the pressure measured by the pressure sensor is the pressure to be measured; S4: Read the value displayed on the ohmmeter, and adjust the pressure between the upper and lower rollers of the fuser until the ohmmeter reaches the set standard value; S5: After the pressure measurement and pressure adjustment are completed, the transmission gear is rotated in the reverse direction and the pressure sensor is withdrawn from the fuser.

Images